Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2011-11-09
ApJ, 2012, 747, 8
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
28 pages, 7 figures, version accepted to ApJ
Scientific paper
10.1088/0004-637X/747/1/8
We explore a detailed model in which the active galactic nucleus (AGN) obscuration results from the extinction of AGN radiation in a global flow driven by the pressure of infrared radiation on dust grains. We assume that external illumination by UV and soft X-rays of the dusty gas located at approximately 1pc away from the supermassive black hole is followed by a conversion of such radiation into IR. Using 2.5D, time-dependent radiation hydrodynamics simulations in a flux-limited diffusion approximation we find that the external illumination can support a geometrically thick obscuration via outflows driven by infrared radiation pressure in AGN with luminosities greater than $0.05\, L_{\rm edd}$ and Compton optical depth, $\tau_{\rm T}\gtrsim 1$.
Bisnovatyi-Kogan Gennadi S.
Dorodnitsyn Anton
Kallman Tim
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